trim() === ''){ document.write('String is empty'); } Following is the output of the above program −String is empty So, we have seen how to check the empty string in JavaScript using the length property and trim() method. Print Page Previous Next ...
Learn how to check if an input field is empty in React using different methods, such as empty string validation, react hook form, and JavaScript. This tutorial will show you how to handle empty field validation in React JS with examples
How to Check String is Empty or Not in Javascript? In this example, we use JavaScript to check string is empty or null using !str || str.trim().length === 0;. This expression evaluates to true if the string is empty or null, and false otherwise. You can check and edit this code...
constisEmpty=require('check-empty-string');// When displayed on screen, it's a blank usernameconstrawUsername='\u202E\u202E\u202E\n'// they are not conventional spaces// JavaScriptif(rawUsername.trim().length<2){console.error('Invalid username!');};// check-empty-stringif(isEmpty....
You may be wondering why do we need the constructor check. Well, it's to cover for the wrapper instances. In JavaScript, we have 9 built-in constructors.new Object(); new String(); new Number(); new Boolean(); new Array(); new RegExp(); new Function(); new Date(); So we ...
In this tutorial, we are going to show you the ways of checking whether the JavaScript string is empty, undefined, or null. Just follow the guidelines.
While writing a program or any script or any piece of frontend code in Javascript, if you want to check if an array is empty or not, you can use the length property of arrays in Javascript. The length property of the array returns the count of the number of elements stored in the ...
TheJSON.stringifymethod is used to convert a JavaScript object to a JSON string. So we can use it to convert an object to a string, and we can compare the result with{}to check if the given object is empty. Let’s go through the following example. ...
To check if a string is not null and not empty in Java, you can use the length() method of the java.lang.String class to check if the string is empty, and the != operator to check if the string is not null. Here is an example of how you can do this:
Let’s jump right in. How to Check If an Object Is Empty in JavaScript Use Object.keys Loop Over Object Properties With for…in Use JSON.stringify Use jQuery Use Underscore and Lodash Libraries 1. Use Object.keys Object.keys will return an array, which contains the property names of the ...